A sequel to Call of Duty: Black Ops, one of the best-selling games of all-time, may seem more likely as it appears Activision has secretly acquired the domain name blackops2.com.

First registered in May 2010 shortly after Black Ops was announced, the domain remained under Whois privacy up until this week using Go Daddy’s Domains by Proxy service.

Now, the domain blackops2.com (Whois) has switched from Domains by Proxy to the privacy service provided by internet brand protection company MarkMonitor, who caters to over half the Fortune 100, of which Activision is a client.

In August, I reported that Activision went through MarkMonitor to buy up a slew of Black Ops domains, all the way up to BlackOps6.com.

Missing from the list was blackops2.com.

A deal has now apparently been struck.

Treyarch, the development studio behind Call of Duty: Black Ops, hasn’t officially gone on record to say it is creating a sequel. But with all these domain acquisitions, signs point to a Black Ops 2 being a very strong possibility in 2012.

If a cash amount was paid, the sale price of the domain will likely remain unknown, as the previous owner’s identity and contact information were hidden through Go Daddy’s privacy service.